Vertiv Liebert HPM User manual

Liebert HPM
5-99 kW Indoor Room Cooling Units
A/W/F/D/H Versions
User Manual
English, cod. 265011, rev. 23.01.2018

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EnglishLiebert HPM --- A/W/F/D/H
Caution
We recommend that:
S the manual is retained for the entire service life of the machine;
S the user reads the manually carefully before carrying out any operations on the machine;
S the control is used exclusively for the purpose for which it is intended; incorrect use of the control shall release the
manufacturer from any liability.
This manual has been prepared to enable the end---user to carry out only the operations that can be made with the panels
closed. Any operations that require the opening of doors or equipment panels must be carried out only by qualified per-
sonnel.
Each machine is equipped with an Electric Insulating device which allows the operator to work in conditions of safety.
Switch off the machine with this electric insulating device before any maintenance operation to eliminate risks
remaining (electric shocks, burns, automatic restarting, moving parts and remote control).
For ”UNDER” units installed on raised floor: switch off the machine before removal of the floor panels within a
distance of 850 mm from the machine, to avoid risks of contact with rotating devices (fans) moving and with hot
heating elements.
The panel key supplied with the unit must be kept by the person responsible for maintenance.
For identification of the unit (model and serial no.) in case of the necessity forassistance orspare parts,locate theidentific-
ation label on the outside of the unit.
Attention: data relevant to the
supplied unit are indicated on the inboard
label (see below empty fax---simile).
Data in the manual are referred to standard
conditions and can be modified without any
advance notice.
POS. DESCRIPTION
1Compressor Full Load Ampere [A]
2Compressor Locked Rotor Ampere [A]
3Compressor quantity
4Evaporator fan Full Load Ampere [A]
5Evaporator fan Locked Rotor Ampere [A]
6Evaporator fan quantity
7Condenser fan Full Load Ampere [A]
8Condenser fan Locked Rotor Ampere [A]
9Condenser fan quantity
10 Electrical heating Ampere
11 Electrical heating steps
12 Humidifier Ampere
13 Steam production capacity
14 Max. unit AC Ampere
15 Max. unit DC Ampere
16 Rated peak withstand current
17 Rated short---time current
18 Refrigerant type
19 High pressure switch Stop
20 High pressure switch Restart
21 Low pressure switch Stop
22 Low pressure switch Restart
23 Min. room operation temperature
24 Max. room operation temperature
25 Min. room operation humidity
26 Max. room operation humidity
27 Max. refrigeration circuit pressure

English Liebert HPM --- A/W/F/D/H
1 432 710
98 17161514131211
Digit 1
Family
S Small
M Medium
L Large
Digit 2 and 3
Size: Cooling Capacity
“kW” (approx.)
Tens of kilowatt
6
The unit is fully defined by seventeen
digits.
5
Digit 4
Air distribution
U Downflow
O Upflow
D Displacement
G Frontal Upflow
Other Configurations
K Constant (Upflow only)
L Constant (Top Frontal Flow
only)
Digit 5
Version
A Air Cooled
W Water Cooled
F Freecooling
D Dualfluid Air Cooled
H Dualfluid Water Cooled
S1EUA
Digit 6 --- Fan
1EC fan Full
2EC fan Light
Digit 7 --- Main Power Supply
0 400 V/3 Ph/50 Hz
Digit 8 --- Electric heating
0None
1Electric heating
Digit 9 --- Humidification
0 None
VElectrode humidifier
Digit 10 ---Microprocessor Control
2ICOM & Inner Display with Temperature Control
3ICOM & Inner Display with Temperature and Humidity
Control
AICOM & Coldfire Display Small with Temperature
Control
BICOM & Coldfire Display Small with Temperature and
Humidity Control
CICOM & Coldfire Display Large with Temperature
Control
DICOM & Coldfire Display Large with Temperature and
Humidity Control
Digit 11 ---Reheating System
0 None
GHot gas coil
WHot water coil
Digit12 ---AirFilterEfficiency
0G4
1F5
2G4; with Clogged Filter Pressure Switch
3F5; with Clogged Filter Pressure Switch
Digit 13 ---Expansion Valve TXV
0 R410A
Digit 14 ---Paint
2 BLACK Vertiv 7021 Colour
Digit 15 ---On board MCB, for Remote Air Condenser
0No MCB
1MCB 6 A single circuit condenser
2MCB 10 A single circuit condenser
Digit 16 ---Packing
For S0F, S0H, S1A and S1D units
FPLP and Pallet
GPLP and Wooden Crate
MSeaworthy
For all other units
PPLP and Pallet
CPLP and Wooden Crate
SSeaworthy
Digit 17 ---Special Requirements
0 Standard Vertiv X Special Vertiv

English
Liebert HPM --- A/W/F/D/H
Index
1 -- Preliminary operations ................................................................. 1
1.1 --- Safety Information 1.........................................................................
1.2 --- Equipment Inspection 1.....................................................................
1.3 --- Packing material 1..........................................................................
1.4 --- Recommended Unit Handling Equipment 1.....................................................
1.5 --- Handling the Unit While Packaged 1...........................................................
1.6 --- Unpacking the Unit 1........................................................................
1.7 --- Removing the Unit from the Skid using a Fork Lift 2..............................................
1.8 --- Moving the Unit to the Installation Location using Piano Jacks 2....................................
1 . 9 --- R e m o v a l o f P i a n o J a c k s 2....................................................................
1.10 --- Base module 2.............................................................................
1.11 --- Operating limits 2...........................................................................
1.12 --- Noise level limits 3..........................................................................
2 -- General description .................................................................... 3
2.1 --- Direct expansion units 3.....................................................................
3 -- Installation ............................................................................ 6
4 -- Refrigeration connections .............................................................. 6
4.1 --- Refrigeration pipeline connections (A and D) 6..................................................
4.2 --- Vacuum creation and refrigerant charge 9......................................................
4.3 --- Refrigeration circuits 10.......................................................................
5 -- Water connections ..................................................................... 10
5.1 --- General warnings 10.........................................................................
5.2 --- Water connections 10........................................................................
5 . 3 --- C h i l le d w a t e r c o n n e c ti o n s ( D a n d H o n l y ) --- ( F i g . d ) 1 0............................................
5.4 --- Cooling water connections (W, F and H only) 10..................................................
5.5 --- Adding ethylene glycol 11.....................................................................
6 -- Electrical connections ................................................................. 12
6.1 --- Electrical connections 12......................................................................
6.2 --- Fan connections 12..........................................................................
6.3 --- Protection degree IP2x check 12...............................................................
6.4 --- Protective features of EC fan 12................................................................
7-- Start-up ..............................................................................13
7.1 --- First start ---up (or after long standstill) 13........................................................
7.2 --- Starting and stopping 13......................................................................
7.3 --- Automatic restart 13..........................................................................
7.4 --- Checking the refrigeration piping pressure drops 14...............................................
8-- Operation .............................................................................14
9 -- Calibrations & Regulation (at start--up) ................................................. 15
9.1 --- Setting the thermostatic expansion valve 15......................................................
9.2 --- Adjustment of the hot gas injection valve as antifreeze mode and partial control of the capacity
(F,D,HandConstant) 15.....................................................................
9.3 --- Chilled water valve (F, D and H only) 15.........................................................
9.4 --- Water condenser flow control valve (F only) 16...................................................
9.5 --- Water leakage sensor (Liquistat) 16.............................................................
9.6 --- Environment protection 16....................................................................
10 -- Maintenance/Spare Parts ............................................................... 16
10.1 --- Safety instructions 16.........................................................................
10.2 --- Spare parts 16..............................................................................
10.3 --- Maintenance schedule 16.....................................................................
10.4 --- Refrigeration circuit 18........................................................................
10.5 --- Dismantling the unit 18.......................................................................
10.6 --- Regulation (EC) no. 842/2006 (F --- gas) 18.......................................................
Enclosures
HUMIDAIR humidifier ........................................................................ A--1
Technical data tables ........................................................................ B--1
Installation drawings ........................................................................ C--1
Refrigerant and hydraulic connections ........................................................ D--1
Refrigeration circuits ........................................................................ E--1
Hot water circuit ............................................................................. F--1
Maintenance ................................................................................ G--1

CENTER OF
GRAVITY HEAVY SIDE!
Unit weight is unbalanced.
Improper lifting can cause
personal injury, death, or
damage to unit. Lift unit
from this side only.
WARNING
1English Liebert HPM --- A/W/F/D/H
1 --- Preliminary operations
1.1 -- Safety Information
WARNING!
Risk of top---heavy unit falling over! Improper
handling can cause equipment damage, inju-
ry, or death! Read all of the following instruc-
tions before attempting to move, lift, remove packaging
from, or preparing unit for installation.
CAUTION!
Risk of sharp edges, splinters and exposed fa-
steners! Can cause personal injury! Only pro-
perly trained personnel wearing appropriate
safety headgear, gloves, shoes and glasses should attempt
to move, lift, remove packaging from the unit or prepare the
unit for installation.
CAUTION!
Risk of overhead interference! Can cause unit
and/or structure damage! The unit may be too
tall to fit through a doorway while on the skid.
Measure the unit and doorway heights and refer to the instal-
lation plans prior to moving the unit to verify clearances.
CAUTION!
Risk of unit damage if improperly stored! Keep
the unit vertically upright, indoors, and protec-
ted from dampness, freezing temperatures,
and contact damage.
ATTENTION!
The conditioner must never be installed out of
doors.
See drawings in Enclosures C.
1.2 -- Equipment Inspection
Upon arrival of the unit, and before unpacking, verify that the
labeled equipment matches the Bill of Lading. Carefully in-
spect all items for either visible or concealed damage. Dam-
age should be immediately reported to the carrier and a
damage claim filled in with a copy sent to your sales repres-
entative.
1.3 -- Packing material
Allmaterialusedtopackagethisunitisrecycla-
ble. Please save for future use, or dispose of
the material appropriately.
1.4 -- Recommended Unit Handling Equipment
Fork Lift
Piano
Jacks
Pallet Jack
Spreader
Bars and
Slings
1.5 -- Handling the Unit While Packaged
S If possible transport unit using a fork lift or pallet
jack;
otherwise use a crane with slings and spreader bars.
S If using a fork lift or pallet jack, make sure the fork (if ad-
justable) are spread to the widest allowable distance to
still fit under the skid. Also, ensure the fork length is suit-
able for the unit length.
SWhen moving the packaged unitwith a fork lift,lift the unit
from the designated side of the unit no higher than
152mm off the ground. If circumstances require the unit
to be lifted higher than 152mm great care shall be exer-
cised and all by ---standing
personnel are to be no closer
than 5m to the lift point of the
unit.
SAlways refer to the location of
the Center of Gravity indicat-
ors when lifting the unit from
any other side.
SUse the center of gravity indicators on the unit panels to
determine the position of the slings.
SCenter of gravity varies per unit size and selected op-
tions.
SSlings shall be equally spaced on either side of the cen-
ter of gravity indicator.
SPlace the slings between the unit bottom rails and the
skid.
Equal
Distance Equal
Distance
1.6 -- Unpacking the Unit
1) Remove the exterior
stretch wrap packaging
material from around the
unit, exposing the pro-
tective corner and side
packaging planks.
2) Remove the corner and
side packaging planks
from the unit, exposing
the bag over the unit. The
bag may remain in place
for dust and panel protec-
tion, or be removed for im-
mediate unit installation.

2
English Liebert HPM --- A/W/F/D/H
3) Remove the bag from the
unit when ready to re-
move the skid and install
the unit.
1.7 -- Removing the Unit from the Skid using a
1)
Fork Lift
S Align a fork lift with
either the front or
rear side of the
unit.
SEnsure the tines of
the fork lift are
locked to the
widest location.
SUse the center of
gravity indicators
on the unit panels
when determining
the entry points for the tines.
SCenter of gravity varies per unit size and selected op-
tions.
STines shall be equally spaced on either side of the
center of gravity indicator.
2)
SInsert the tines of
the fork lift under
the base of the
unit.
SEnsure the tines
are level, not
angled in an up-
ward direction.
STines are to be at a
height that will al-
low proper clear-
ance under the unit.
SEnsure the tines extend beyond the opposite side of
the unit.
SIf these steps are not followed , damage may occur
to the panels and/or base of the unit.
3)
SRemove four (4)
bolts, two (2) on
each side of the
pallet. Bolts can
be removed
using a 1/2”
socket
wrench,
open---end
wrench, or pli-
ers.
1.8 -- Moving the Unit to the Installation Loca-
tion using Piano Jacks
1) Acquire piano jacks,
and with the unit elev-
ated, place the piano
jacks into position
where one is at each
end of the unit.
2)
SLower the unit to a
height suitable for
the piano jacks.
SPlace protective
material between
the unit and the pi-
ano jacks and
straps.
SWith the unit se-
cured to the piano
jacks, move the
fork lift and pallet
away from the
unit.
3) Using the piano jacks,
at least two trained
personell can move
the unit to the site for
installation.
1.9 -- Removal of Piano Jacks
S Lower the unit as far the piano jacks will allow.
S Undo all strapping holding the piano jacks to the unit.
S Use a pry bar or similar device and on one end of the unit
with a piano jack, lift the unit just enough to allow for the
removal of the piano jack.
SRepeat the previous step to remove the piano jack on the
opposite end.
SRemove all material that might have been used to protect
the unit from the piano jacks and strapping.
1.10 -- Base module
If there is no raised floor below the unit it must be placed on a
base module to allow access to the external connections.
The conditioner is connected to the base module by 4
screws.
1.11 -- Operating limits
The units are designed to operate within working ranges
(see Tab. a).
These limits are referred to new machines or to those that
have been correctly installed and serviced.
The warranty clauses are no longer valid for any possible
damage or malfunction that may occur during or due to op-
eration outside the application values.
Tab. a --- Operating limits
For all units
Room air conditions from:
18°C, 45% R.H.
for L8FUx, L9HUx:
21°C, 40% R.H.
Room air conditions to: 27°C, 55% R.H
Hot water circuit
inlet water
temperature max. 85°C
water pressure max. 8.5 bar
Storage conditions from: --- 2 0 °C
to: 50°C
Power supply tolerances V±10%
Hz ±2

3English Liebert HPM --- A/W/F/D/H
For A and D units
Outdoor temperature: lower limit
Exceeding of winter lower limits will temporarily cause a compressor
stop.
down to +10° C from +9° C to
--- 2 0 ° C b e l o w --- 2 1 ° C
standard unit VARIEX required Consult HPAC Tech-
nical Sales Support
Outdoor temperature: higher limit
This limit is determined by coupled condenser model. Exceeding of this
limit (or a lack of maintenance), will caused a compressor stop by HP
safety thermostat. Reset to normal operation can only be carried out
manually.
Relative position room unit vs. remote condenser
From unit to condens-
er max distance
up to 30 m
equivalent length
from 30 to 50 m
equivalent length
From unit to condens-
er max geodetic
height (1) (2)
from 20 m to ---3 m from 30 m to ---8 m
Requirements
Pipe diameter see Tab. c see Tab. c
Oil traps on vertical
line of gas refrige-
rant
every 6 m, max every 6 m, max
Extra oil charge see Tab. 8 see Tab. 8
Variex installation suggested mandatory
Condenser design oversized +15%
Hot gas reheat allowed NOT allowed
Additional non
return valve on deli-
very line, at 2 m
from compressor
not
necessary mandatory
For W, F and H units
Water or mixture temperature to condenser,
lower limit (other information par. 5.4) min. 5° C
For F, D and H units
Chilled water circuit
inlet water temperature min. 5°C
water pressure max. 16 bar
Max. differential pressures on the modulating valve
(2 or 3 ways)
--- Max. differential pressure through the closed valve: Δpcv
--- Max. differential pressure across the valve for modulating service:
Δpms
Models Δpcv (kPa) Δpms (kPa)
S1GxF/D/H 300 300
S2ExF/D/H 300 300
S2GxF/D/H 300 300
M2HxF/D/H 300 300
M3FxF/D/H 175 175
M3GxF/D/H 175 175
M4ExF/D/H 175 175
M4HxF/D/H 175 175
M5BxF/D/H 175 175
M5CxF/D/H 175 175
M5DxF/D/H 175 175
L8FxF/D/H 150 200
(1) Positive difference in height: condenser above conditioner
(2) Negative difference in height: condenser below conditioner
Other information in para 5.3.
1.12 -- Noise level limits
The sound pressure level in free field at 1.5 m height and 2 m
in front of the air conditioner, with compressor and fan in op-
erations, is less than 70 dBA for all models.
2 --- General description
2.1 -- Direct expansion units
2.1.1 --- Refrigeration circuit
All models are provided with a single refrigeration circuit, M
and L ranges present also double circuit units. The com-
pressor (1) pumps the hot gaseous refrigerant into an out-
door air---cooled condenser (2). The liquefied refrigerant ar-
rives to a liquid receiver (3) that ensures a constant and even
refrigerant flow to the thermostatic expansion valve (4) and
then arrives to the evaporator (5). Here the refrigerant,
thanks to the heat --- exchanged with the room air moved by
the fan (6) --- evaporates and returns to the compressor (1);
from this, the refrigerant begins a new refrigeration cycle. To
maintain the correct refrigerant discharge pressure, the
speed of the motor fan (8) is controlled (on---off or propor-
tional mode).
Shut---off valves are provided as standard to assist with
routine maintenance.
The compressor (1) has abuilt---in non---returnvalve toavoid
return of liquid refrigerant from the condenser in summer-
time, thus protecting the compressor from undesired refri-
gerant slugging during the start up. A second non---return
valve (7) is recommended to avoid --- in wintertime --- refri-
gerant migration from the liquid pipes and the receiver (3) to
the condenser (2), that should be responsible of low pres-
sure intervention at the start---up of compressor.
For safety reason, a relief valve (9) is installed on the liquid
receiver (3); this valve is equipped with flanged connections
so that the refrigerant may be discharged to the outside.
2.1.2 --- Version A
External air---cooled condenser (2)
The units may be connected with a wide range of our con-
densers in standard or low noise version. For technical data
and performance, refer to the relevant technical documenta-
tion.
Note 1. Units and external condensers are supplied separ-
ately.
Note 2. The room unit refrigeration circuit is pressurised
with helium at 3 bar and the condenserrefrigeration circuit at
2bar with dry air.
Note 3. The customer is responsible for making connec-
tions between the Unit and the external condenser and for
charging with refrigerant (standard R410A) and oil, when re-
quest.
SxxUA
MxxUA
LxxUA
Units
1
2
4
8
5
6
3
9
7
2.1.3 --- Version W
Water---cooled condenser
These units are provided with one very efficient stainless
steel brazed---plate water---cooled condenser (2). The con-

4
English Liebert HPM --- A/W/F/D/H
denser is fitted with an head ---pressure regulating valve (8)
for the automatic control of condensing pressure.
The units operate with mains water or closed circuit with
an external Dry Cooler. When operating in a closed circuit,
to avoid undesired ice formation in wintertime, it is advisable
to use water/glycol mixture: refer to Chap. 5 for the percent-
ages to be used at minimum ambient temperatures. Dry
Coolers are available as an option; water --- glycol mixture
and circulation pump(s) are normally supplied by others.
If mains water is used, a mechanical filter must be fitted in the
water circuit to protect the plate condenser (2) (for other in-
formation see the Service Manual).
To reduce water and energy consumption (pump), it’s advis-
able to adopt a cooling water control valve (by the user), able
to stop water feeding when unit is off.
Unit microprocessor control gives a 24V contact (10VA max,
please refer to the relevant Wiring Diagram, 58 and G termin-
als) to drive that valve.
Note. The water ---cooled Liebert HPM versions are filled
with the complete charge of the requested refrigerant
(standard R410A).
SxxOW
MxxOW
Units
1
2
3
9
4
8
5
6
7
Cooling Water
2.1.4 --- Freecooler units --- Version F
Freecooling mode
The Freecooler unit cools the air flow by means of the air re-
frigerant coil (5) in direct expansion rows [direct expansion
mode] or, as an alternative, the air/water coil (5) in freecool-
ing rows [freecooling mode]. Wheneverthe outdoortemper-
ature is at least 5 degrees below the indoor return temperat-
ure, the water flow is cooled by an external Dry Cooler (10)
and passes through the coil (5). When the externaltemperat-
ure is higher than ZET (Zero Energy Temperature), the water
exchanges heat with the refrigerant in the water---cooled
plate condenser (2). When the external temperature is below
ZET, the water is cooled as much as to cool the room air dir-
ectly in the air/water coil (5, freecooling rows).
Water/glycol circuit
The units operate with water in closed circuit with an ex-
ternal Dry Cooler (10), cooled by the outside ambient air.To
avoid undesired ice formation in wintertime, it is advisable to
use water/glycol mixture: refer to the Service Manual for the
percentages to be used at minimum ambient temperatures.
The circulation of the water---glycol mixture is forced (the
pump (11) and the water---glycol mixture are not supplied).
The unit is provided with 2---way modulating valve (12) to
control the glycoled---water flow passing through the water/
glycol coil. A solenoid valve (13) allows the water flow to the
condenser.
The opening or closing signals, generated by the electronic
controller, manage the valve actuator movement in order to
maintain the desiderd conditions in the conditioned room.
SxxOF
MxxOF
Units
19
4
8
5
6
7
10
11
3
13
2
12
2.1.5 --- Air---cooled condenser dualfluid units
Version D
Dualfluid modes
The Dualfluid unit cools the air flow by means of the air refri-
gerant coil (5) in direct expansion rows [direct expansion
mode: see refrigeration circuit] or, as an alternative, the air/
water coil (5) in the chilled water rows [chilled water mode].
SxxUD
MxxUD
L8FUD
Units
Chilled Water (from Customer)
8
9
1
5
6
2
7
3
4
2.1.6 --- Water---cooled condenser dualfluid units
Version H
Dualfluid mode
The Dualfluid unit cools the air flow by means of theair---refri-
gerant coil (5) in direct expansion rows [direct expansion
mode: see refrigeration circuit] or, as an alternative, the air/
water coil (5) in the chilled water rows [chilled water mode].
SxxOH
MxxOH
Units
Cooling Water
Chilled Water
(from Customer)
1
2
3
9
4
8
5
6
7

5English Liebert HPM --- A/W/F/D/H
2.1.7 --- Constant K/L
Refrigeration circuit
All models are provided with a single refrigeration circuit.
The compressor (1) pumps the hot gaseous refrigerant into
an outdoor air---cooled condenser (2). The liquefied refriger-
ant arrives to a liquid receiver (3) that ensures a constant and
even refrigerant flow to the thermostatic expansion valve (4)
and then arrives to the evaporator (5). Here the refrigerant,
thanks to the heat --- exchanged with the room air moved by
the fan (6) --- evaporates and returns to the compressor (1);
from this, the refrigerant begins a new refrigeration cycle. To
maintain the correct refrigerant discharge pressure, the
speed of the motor fan (8) is controlled (on---off or propor-
tional mode).
When the cooling capacity of the room unit is higher than the
room load and the room temperature tends to decrease, the
hot gas valve (11) opens and the hot gas coil (10) heats the
treated air, maintaining the room at the requested restricted
temperature conditions.
Shut---off valves are provided as standard to assist with
routine maintenance.
The compressor (1) has abuilt---in non---returnvalve toavoid
return of liquid refrigerant from the condenser in summer-
time, thus protecting the compressor from undesired refri-
gerant slugging during the start up. A second non---return
valve (7) is recommended to avoid --- in wintertime --- refri-
gerant migration from the liquid pipes and the receiver (3) to
the condenser (2), that should be responsible of low pres-
sure intervention at the start---up of compressor.
For safety reason, a relief valve (9) is installed on the liquid
receiver (3); this valve is equipped with flanged connections
so that the refrigerant may be discharged to the outside.
SxxKA
MxxKA
Units
1
2
3
9
4
8
7
6
10
5
11
SxxKW
MxxKW
Units
Cooling Water
12
3
9
8
5
6
7
10
11 4

6
English Liebert HPM --- A/W/F/D/H
The units are available in the four configurations shown below.
U/UNDER
Downflow
O, K / OVER
Upflow with front air return
D / DISPLACEMENT
Frontal air discharge at floor level
G/GRILL
L / CONSTANT
Frontal upflow with front air return
S0F model
3 --- Installation
ATTENTION: The conditioner must never be installed out of
doors. See drawings in Enclosures C.
Note for Conditioner version Over with elec-
trical heaters. If the unit is ducted with air duc-
ts not supplied by us, pay attention to the
positioning of the insulation material.
To avoid overheating of the insulation or sound-
proof material inside the air duct, the insulation
material must be positioned at minimum 30cm
above the top of the unit.
4 --- Refrigeration connections
4.1 -- Refrigeration pipeline connections
(A and D)
The air condensing units are delivered helium ---pressur-
ized at 1 bar.
The discharge operation of the room unit
pressurized with helium (at 1 bar) and the
de ---welding of the bottoms from the
connections must be carried out as last
operations, immediately followed by the
connection and emptying of the whole
system.

7English Liebert HPM --- A/W/F/D/H
4.1.1 --- General layout (Tab. b)
1) In soft or hard copper.
The diameter required is stated in Tab. c.
If the installer intends to use pipes of a larger diameter
(e.g. for long winding runs) then consult HPAC Technical
Sales Support.
Use as short refrigeration pipelines as possible to minim-
ize the total charge of refrigerant and the pressure drops.
Forlongruns(over50equivalentm)contactHPACTech-
nical Sales Support.
Lay the horizontal gas pipes with 1% downward gradient
towards the refrigerant flow.
2) Reduce the number of bends, which must be of large ra-
dius, to a minimum.
3) Insulate the piping as specified in Tab. b. If the pipes are
putnexttoelectricalcablesitisadvisedtoinsulatethem
to avoid damage to cable insulation.
4) There must be a minimum separation of 20 mm between
the gas and liquid pipelines.
If this is not possible insulate both lines.
5) Support both horizontal and vertical pipes with vibra-
tion---damping clamps (which include rubber gaskets).
Place these every 1.5 --- 2 m.
Fig. a --- Recommended pipe layout
2
1
3
4
5
Tab. b --- Condenser positioning
CONDENSER
POSITION
CONDENSER ABOVE
CONDITIONER
CONDENSER AND
CONDITIONER
AT SAME LEVEL
CONDENSER BELOW
CONDITIONER
(not recommended)
INSULATION
gas int. necessary necessary necessary
ext. only for aesthetic reasons only for aesthetic reasons only for aesthetic reasons
liq. int. absolutely not not necessary no (expose to cold underfloor air)
ext. only for aesthetic reasons only if exposed to sun only if exposed to sun
LAYOUT
6m
(see *) gas
liquid
(*) Oil traps every 6 m of
vertical piping
room unit
(see **)
gas
liquid
room unit
liquid
room unit
(see **)
(**) see Chap. 1, Tab. a.

8
English Liebert HPM --- A/W/F/D/H
4.1.2 --- Pipe diameter
The diameters of the connecting pipes between the condi-
tioner and the condensing unit listed in Tab. c must be re-
spected, otherwise the guarantee becomes invalid.
Tab. c --- Pipe diameters (room unit --- remote condenser)
STANDARD PIPE DIAMETERS
(Valid for equivalent lengths up to 50 m)
MOD.
copper tube
external diametre x thickness
[mm]
R410A
Gas Liquid
S0F 10 X 1 10 X 1
S0H 12 X 1 12 X 1
S1A 12 X 1 12 X 1
S1D 14 X 1 14 X 1
S1E 14 X 1 14 X 1
S1G 16 X 1 16 X 1
S2E 18 X 1 16 X 1
S2G 22 X 1.5 18 X 1
M2H---M3A 22 X 1.5 18 X 1
M3F 16 X 1 16 X 1
M3G 22 X 1.5 18 X 1
M4E---M5B 22 X 1.5 18 X 1
M4H 18 X 1 16 X 1
M5C---M5D 22 X 1.5 18 X 1
M7L 22 X 1.5 18 X 1
L8F 28 X 1.5 22 X 1.5
L9H 28 X 1.5 22 X 1.5
Whenthepipesaremorethan50mlong,
contact Technical Support Department
4.1.3 --- Installing pipelines
THE FOLLOWING OPERATIONS MUST BE CARRIED OUT
BY AN EXPERIENCED REFRIGERATION TECHNICIAN.
The discharge operation of the room unit
pressurized with helium (at 1 bar) and the
de ---welding of the bottoms from the
connections must be carried out as last
operations, immediately followed by the
connection and emptying of the whole
system.
1) Lay the piping, taking note of the following:
SWelding:
SAll joints must be braze---welded.
SAvoid butt welds by using sleeves or enlarging
one of the pipes using a pipe opener.
SUse silver---based solders and the correct appar-
atus.
SGuarantee a correct weld as a refrigerant leak, or
a faulty weld which leads to a leak later on, can
seriously damage the air conditioner.
SAlways use large---radius curves (bending radius at
least equal to pipe diameter). Bend the pipes as fol-
lows:
Ssoft copper: by hand or bending device.
Shard copper: use preformed curves. Do not over-
heat the pipes when welding so as to minimize
oxidation.
2) Connect the pipes to the condenser:
SCondensers with butt---welded pipe connections:
cut the pipe, enlarge it and weld it to the pipeline.
SCondensers with threaded tap connections: flange
the pipes and connect.
RESPECT THE DIRECTION OF REFRIGERANT
FLOW (SEE LABELS ON REFRIGERANT CON-
NECTIONS).
3) Wash out the pipelines as follows:
a) Plug up the free ends of the pipes.
b) Connect a helium or nitrogen cylinder, fitted with a re-
ducer (max. pressure 10 bar), to the ¼” SAE
Schrader valve of the condenser.
c) Pressurize the pipes with helium or nitrogen.
d) Unplug the pipes instantaneously.
e) Repeat a) --- d) several times.
THIS OPERATION IS ESPECIALLY IMPORTANT WHEN
HARD COPPER PIPING IS USED.
4) Open all the room unit shut---off valve.
5) Discharge the room unit pressurized with helium (at 1
bar) opening the charge valves so that all the branches
of the circuit are discharged (e.g. on the receiver, on the
low pressure side and on the compressor delivery).
6) De---weld the bottoms from the connections of the room
unit.
7) Fix (weld) the pipes to the connections on the air condi-
tioner.
8) Connect the refrigerant safety valve to the outdoor with
a copper pipe sized in order to satisfy the requirements
of EN13136 (i.e. till 10m length, i 26mm).
Tab. d --- Weight of refrigerant contained in piping during operation
EXTERNAL PIPE
DIAMETER
(mm)
gas (*)
liquid (+), at different condensing
temperatures
R410A (kg/m)
35.0 _C46.0 _C57.0 _C
10 x 1 0.0048 0.0507 0.0470 0.0426
12 x 1 0.0075 0.0793 0.0734 0.0665
14 x 1 0.0108 0.1142 0.1056 0.0958
16 x 1 0.0147 0.1554 0.1438 0.1304
18 x 1 0.0192 0.2030 0.1878 0.1703
22 x 1.5 0.0271 0.2862 0.2648 0.2402
28 x 1.5 0.0469 0.4956 0.4585 0.4158
(*) Due to the small weight influence (at 15.5 bar --- discharge temp. 65_C), only 0.062 kg/l for R410A is considereted.
(+) Liquid pressure and density varies according to condensing temperature (see refrigerant tables).

9English Liebert HPM --- A/W/F/D/H
Tab. e --- Equivalent lengths (m) of: curves, shut ---off and non---return valves
Nominal
diameter
(mm)
90°45°180°90°
12 0.50 0.25 0.75 2.10 1.90
14 0.53 0.26 0.80 2.20 2.00
16 0.55 0.27 0.85 2.40 2.10
18 0.60 0.30 0.95 2.70 2.40
22 0.70 0.35 1.10 3.20 2.80
28 0.80 0.45 1.30 4.00 3.30
4.2 -- Vacuum creation and refrigerant charge
Check the refrigerant type to be used on
the data plate of the air conditioner and
on the refrigerating compressor.
Fig. b --- Pump and refrigerant charging cylinder con-
nection for vacuum creation and refrigerant
charge
R.L.
10
(*)
10a
11
11a
14
13
12
10b
(*) only with reheating coil (optional)
4.2.1 --- R410A precharge (A and D)
1) Open all cocks of the system including those used
for pressurizing (ambient unit and condensing unit).
By this operation all the components of the refrigerating
circuit must be subject to vacuum.
2) Connect a proper, high efficiency vacuum pump (10) suit-
able for polyester oils to the couplings:
--- Compressor intake and delivery using, if available,
the three ---way Rotalock cocks, coupling 1/4” SAE
(make sure that all three ways are open), otherwise
the Schrader valves welded on the pipings.
--- Three ---way Rotalock cock,coupling 1/4” SAE of
the liquid receiver (12) (makesurethatallthree
ways are open).
--- Schrader coupling (13) fit on the compressor or fan
space, if the reheating coil option is available.
3) Provide for a connection with refrigerant cylinder be-
fore making vacuum.
4) Make the system vacuum up to 0.3 absolute mbar and
after 3 hours check if 1.3 absolute mbar have not been
exceeded. This condition warrants a humidity lower than
50 ppm inside the system.
If the complete vacuum is not possible, this means that
there are some leaks (to be removed according to the in-
structions in 6 below).
NEVER USE THE COMPRESSOR TO CREATE A VACU-
UM (THIS INVALIDATES ITS GUARANTEE).
5) Break the vacuum as follows:
a) Close the cock (10a) for the vacuum pump (10).
b) Open the cock of the refrigerant cylinder (11a) until
the system reaches a pressure value of about 1 bar.
The refrigerant must be introduced
and charged by taking only liquid
fluid from the cylinder.
c) At this point both the vacuum pump and the refriger-
ant cylinder can be disconnected as follows:
c1) close the cylinder cock (11a)
c2) close the way 5/16” SAE of the connected
Schrader valves.
6) Inspect all connections/joints using a leak detector. If a
leak is found, empty the pipes and the condenser, seal
the leak and repeat the instructions in 3) --- 6).
7) Now the machine is ready for completing the charge and
the start---up.
8) Charge the refrigerant (ONLY LIQUID)bymeansofthe
charge valve placed at the evaporator inlet.
4.2.2 --- R410A refrigerant charge (A and D)
1) Start the unit as described in para. 7.1.
2) Manually start the compressor (ensure the unit is not in
the dehumidification phase).
3) Guarantee a constant condensation temperature
(preferably 42--- 45°C); if necessary, partially obstruct the

10
English Liebert HPM --- A/W/F/D/H
condenser coil surface or limit its ventilating power to ob-
tain these conditions.
4) Charge the unit until the working conditions of the entire
refrigeration circuit have become normal.
5) Using a manometer, check that the evaporating temper-
ature is above 0_C.
5) Verify that the superheat is 5---8 K (to do this refer to para.
9.1).
4.3 -- Refrigeration circuits
See drawings in Enclosure E.
5 --- Water connections
5.1 -- General warnings
ENSURE THAT THE TUBING DOES NOT OBSTRUCT THE
AIR FLOW(Under only).
IF THE TUBING IS TO RUN OUTDOORS, ADD ETHYLENE
GLYCOL TO THE CIRCUIT AS DESCRIBED IN PARA. 5.5.
5.2 -- Water connections
--- Condensate drain (Fig. c):
SUse galvanized steel, PVC or flexible polythene
tubing.
SAllow a 2% gradient towards the drain.
SThere must be a drain trap (1) placed at least 20 cm
below the drain tray (2). In the units S13÷S23, Mxx
and Lxx the drain trap must be placed under the unit,
in the false floor.
SFill the drain trap with water (3).
F i g . c --- C o n d e n s a t e d r a i n
BRACKET
to be
connected
by user
2
3
min.
120 cm
min.
10 cm
--- H u m i d i f i e r (optional):SeeEnclosure A.
--- H o t w a t e r (optional):
SUse copper or steel (Mannesmann) tubing.
SInsulate both tubes using Armaflex insulation.
5.3 -- Chilled water connections
(D and H only) --- ( F i g . d )
SUse copper or steel (Mannesmann) tubing.
SPlace the tubing on supporting saddles (1).
SInsulate both tubes using Armaflex insulation (2).
SPlace shut---off ball valves (3) at the conditioner inlet and
outlet to allow easy maintenance.
SIt is useful to install a thermometer (4) and a manometer
(5) at the conditioner inlet and outlet.
SInstall a water drain tap (6) at the lowest point in the cir-
cuit.
SJoin the threaded water connections. It is recommended
to use hemp and paste to get a reliable pressure---tight
joint.
SFill the circuit with water/glycol (see Fig. d).
Air
1 6 3
4 5
2
conditioner
F i g . d --- C h i l l e d w a t e r c i r c u i t
5.4 -- Cooling water connections (W, F and H only)
The unit must receive cooling water as follows:
a) from an external cooling water source, in open circuit
(para. 5.4.1 and Figures in Enclosures).
b) using a Dry cooler, in closed circuit (para. 5.4.2).
SConnect the piping as shown in Enclosures D.
SIt is advisable to use hoses to be connected, with
3---piece joints, to the condenser water inlet and outlet
couplings.
SIMPORTANT: fit a standard strainer on the inlet water pip-
ing.
SPlace shut---off ball valves at the conditioner inlet and
outlet to allow easy maintenance.
SIt is advisable to install a water drain system at the lowest
point in the circuit.
SFully drain the piping before connecting it to the air con-
ditioner.
5.4.1 --- Notes for open circuit applications
SUse the unit with mains or well water.
DO NOT USE WATER FROM AN EVAPORATIVE COOL-
ING TOWER UNLESS THE FILLING WATER HARD-
NESS IS CONTROLLED.
SThe water pressure must be 2 --- 10 bar (if this is not so,
contact the Technical Support Department).

11 English Liebert HPM --- A/W/F/D/H
SThe required water flow at different temperatures is given
in our catalogues or on request.
SIf necessary (very low water temperature) insulate both
pipes using Armaflex insulation.
5.4.2 --- Notes for closed circuit applications
S The installation in Fig. e is indicative only; for individual
installations follow the project diagram.
S Install a pump system calculated on the basis of the
flow and total head of the system (see project data), and
controlled by the compressor running (see label on
the unit).
SInsulate both pipes using Armaflex insulation.
SVERY IMPORTANT: Add water and ethyleneglycol tothe
circuit, when the ambient temperature is below zero (re-
ferring also to para. 5.5). Do not exceed the nominal op-
erating pressure of the circuit components.
SBleed air out of the circuit.
5.5 -- Adding ethylene glycol
Tab. f --- Ethylene glycol to be added to water
freezing temperature
(_C) 0--- 5 --- 1 1 --- 1 8 --- 2 7 --- 3 9
ethylene glycol to add
to water (% in weight of
total mixture)
010 20 30 40 50
N.B. Values are for Shell antifreeze 402. For different brands
check manufacturer’s data.
NOTES:
STo avoid stratification run the circulation pump for at least
30 min. after adding any glycol.
SAfter adding water to the water circuit, disconnect the
unit from the sanitary water piping system; in this way
the water mixed with glycol won’t return into the same
piping system.
SAfter any topping---up of water check the glycol concen-
tration and add any glycol if necessary.
SThe hydraulic features of the system vary by adding
glycol. Therefore check the head and the flow rate of the
pump to be used.
Fig. e --- Advised Dry cooler Installation
APPLIANCE
TSHTC
Stand ---by pump
disconnect
after charge
filling
water
(optional)
HTC
TS
shut---off valve
pump
non---return valve
manometer
thermostat
Variex (opt.)
safety valve
expansion tank
air separator
charge group (filter,
reducer, non ---return valve)
filling meter
drain (at lowest point)
}(*)
Stand ---by pump
p r e s su r e --- o p e r a t e d b y --- p a s s
See hydraulic drawings in the Enclosures D.

12
English Liebert HPM --- A/W/F/D/H
6 --- Electrical connections
6.1 -- Electrical connections
1) Before proceeding with the electrical connections, en-
sure that:
Sall electrical components are undamaged;
Sallterminalscrewsaretight;
Sthe supply voltage and frequency are as indicated on
the unit.
2) Power supply cable connections:
SConnect the cable to the Line inlet terminal board.
SUsethecablesizedefinedaccordingtotheflow,the
supply voltage and the installation type.
SThesystem/linecableprotectionistobearrangedby
the customer. Use a protection with differential
switch. If the system is equipped with EC fans, use
aBtypeswitch.
SDo not fit the supply cable in the raceways inside the
machine electric board.
SUse multipolar cables with sheath (CEI20 ---22) only.
3) Wiring connections (Fig. f):
SConnections for remote on---off and hot water con-
sent must be done by the installer.
SAccording with compressor running, two terminals
for the opening of a water solenoid valve are avail-
able, by installer (W/H units).
SThe General Alarm terminals allow remote alarm sig-
nalling.
4) In case of short circuit, check the sticking of the involved
switch and possibly replace it.
See electrical data in Enclosures B: Technical data
tables.
Fig. f --- Electrical connections
clogged filter (CF)
(CLOSE = OK)
remote on--- off
(CLOSE = ON)
smokestat firestat (AAP)
optional (CLOSE = ON)
water leakage (LWD)
GENERAL ALRM
(400, 401 NC = alarm or unit off)
operating fan
(CLOSE = ON)
operating compressor
(CLOSE = ON)
user alarm
(CLOSE = OK)
freecooling relay enabling, F/D/H only
(CLOSE = ON)
chilled water thermostat enabling,
D version only (CLOSE = compressor ON)
water solenoid valve enabling (by installer) before compressor
i n t e r v e n t i o n , W / H u n i t --- 2 4 Va c --- 1 A m a x
operating compressor 2
(CLOSE = ON)
water solenoid valve enabling (by installer) before compressor 2
i n t e r v e n t i o n , W / H u n i t --- 2 4 Va c --- 1 A m a x
WARNING
(300, 301 NC = warning or unit off)
only on units with EC fan
53
52
61
63
105
106
53
51
400 (NC)
401 (C)
402 (NO)
70
71
72
73
61
62
580
369
83
84
AUXILIARY TERMINAL BOX
(Cooling + Electr. heating + Humidification)
22
0
1 compressor 2 compressors
020
366
1
33
105
106
86
84
400 (NC)
401 (C)
402 (NO)
70
71
72
73
86
030
580
369
710
720
351
355
300 (NC)
301 (C)
302 (NC)
76
77
353
354
6.2 -- Fan connections
The fan is electrically feeded by 1 or 2 autotransformers that
are connected in order to obtain the nominal air flow and the
External Static Pressure (ESP: 20 Pa for Under and 50 Pa for
Over).
To change the factory connection proceed as follow:
--- identify the unit’s aeraulic graph in the Product Docu-
mentation;
--- choose the curve’s point where both the air flow and the
static pressure are the most suitable for the installation;
--- check the factory fan blocks connection and correct it, if
necessary (see electrical diagram);
--- choose the new output fan connections and connect the
wires to the relevant blocks.
6.3 -- Protection degree IP2x check
After whole of the connections and installation works, com-
prising ceiling elements (plenum, ducting) and floor ele-
ments (base frame), check and verify the protection degree
IP2x (protection against finger access, std. IEC 60364---1) at
the boundary of the air conditioner.
6.4 -- Protective features of EC fan
The EC fan has been provided with the following protective
features:
S Over temperature of electronics
S Over temperature of motor
S Locked rotor protection

13 English Liebert HPM --- A/W/F/D/H
SShort circuit at the motor output
With any of these failures, the motor stops (electronically –
no potential separation), the status relay is released.
NO automatic restart. To reset the alarm, power supply has
to be switched off for min. 20s once motor is at standstill.
SMains under ---voltage detection:
if mains voltage falls below 3ph/290Vac (typical value)
for 5s minimum, motor will be swithed off (only by elec-
tronics, no potential separation), status relay is released.
If mains voltage returns to correct values, the motor
will restart automatically.
SPhase failure recognition:
if one phase failes for 5s minimum, motor will be
switched off (only by electronics, no potential separa-
tion), status relay is released.
If all 3 phases return to correct values, the motor will
restart automatically within 10---40s.
The power supply for an external speed setting potentiomet-
er is short---circuit protected.
Motor is overload---protected via motor current limitation.
Warning! Leakage current of the motor is 7 mA roughly.
7 --- Start-up
7.1 -- First start--up (or after long standstill)
TO PREVENT COMPRESSOR DAMAGE THE CRANK-
CASE(S) MUST BE PREHEATED FOR AT LEAST 4 HOURS
BEFORE CONDITIONER START---UP (FAILURE TO DO SO
INVALIDATES THE GUARANTEE).
Start the air conditioner as follows:
1) Open all valves in the refrigeration circuit according to
the instruction label attached to the valve.
2) W, F and H only: Open all valves in the water circuit ac-
cording to the instruction label attached to the valve.
3) Ensure that the refrigerant charge is correct (see Chap.
4).
4) Using a leak detector, verify that there are no refrigerant
leaks. If there are any, then repair the leak and recharge
as described in Chap. 4.
5) At least 4 hours before start---up, close the main switch
and miniature circuit breaker for transformers’ protection
on the electrical panel.
In the “iCom” control system factory setting the stand
alone mode is standard. The stand alone mode gives the
possibility of turning on the unit simply rotating the main
switch on the electric panel. The yellow LED on theiCom
case will light after turning on the unit, because of the
presence of electric power.
If the LED does not light up:
Scheck the electric panel power supply;
Scheck the protection devices (e.g.: thermal
switches);
Scheck the fuses.
6) Verify the operation of the crankcase heater.
7) Check that there are no water leakages.
8) D and H only: Bleed all air out of the chilled water circuit
using the bleed valve on the chilled water coil.
9) If an external condenser or Dry cooler is installed, start
it by supplying power to it.
10) Close all MCBs on the electrical panel.
11) Check the supply voltage on all phases.
12) Check the supply voltage on all phases for the external
condenserorDrycooler,iffitted.
13) ENSURE THAT THE COMPRESSOR HAS BEEN PRE-
HEATED FOR AT LEAST 4 HOURS BEFORE START-
ING THE UNIT.
14) Start the unit by pressing ON OFF (see Fig. g).
15) Check the electrical absorption of all components (see
Chap. 6).
16) Check the electrical absorption of the external condens-
er/Dry cooler, if fitted.
17) IMPORTANT --- If the compressor makes a loud and
unusual noise IT IS NECESSARY TO INVERT the
electrical connections of the phases supplying the
corresponding scroll compressor, which accepts
only one direction of rotation.
18) Ensure that the fans rotate in the correct direction (see
arrow on fan).
CAUTION: risk of contact with rotating devices.
19) Ensure that all control system settings are correct and
that there are no alarms (see Control manual).
20) W, F and H only:Verify thewaterflow.
21) W, F and H only: For closed circuit units ensure that the
water pump starts when the compressor starts.
22) Verify the Fresh Air Intake operation (if fitted).
23) Once the system is operating under load, check the
various components, as follows:
SVerify that the fans are operating properly.
SEnsure that the temperature and relative humidity
are being controlled, and that the humidifier (option-
al) and heating steps (optional) operate when re-
quired.
SEnsure that the compressor operates when required.
SD and H only: Ensure that chilled water valve oper-
ates when required.
SEnsure that the fan operation controller on the ex-
ternal condenser/Dry cooler (if fitted) is calibrated
correctly, and that it controls the fan operation.
7.2 -- Starting and stopping
SALWAYS ENSURE THAT EACH CRANKCASE HAS
BEEN PREHEATED.
FOR BRIEF STOPPAGES KEEP THE SUPPLY TO THE
CRANKCASE HEATER.
Turn on the unit operating on the ON/OFF switch placed on
the left case of the unit (Fig. g). If the ON/OFF remote device
is not installed, the green LED on the iCom case will light up
together with the LED placed below the ON/OFF switch. The
fan starts immediately (the fan always works when the unit is
ON); after 2 minutes the regulation is activated, so the cool-
ing (compressor), heating (electric heaters), humidifying
and dehumidifying devices can start.
Adjust the set---point as indicated in Control manual.
Stop the unit putting the ON/OFF switch in OFF.
7.3 -- Automatic restart
If desired, the unit will automatically restart on the return of
power after a supply interruption (see Control manual).
If the power interruption is expected to be of several hours,
to avoid an automatic cold restart of the compressor stop the
unit before the black---out and, on the return of power, allow
the compressor to preheat before restarting the unit.
F i g . g --- O n --- O f f s w i t c h

14
English Liebert HPM --- A/W/F/D/H
7.4 -- Checking the refrigeration piping pres-
sure drops
Liebert HPM is equipped with connections to check the refri-
geration piping pressure drops:
room unit →condenser →room unit
To carry out this operation it is necessary to use 2 calibrated
manometers and connect them as follows:
M1, connected to the compressor delivery valve;
M2, connected to theSchrader valve (2) of Fig. h.
When the compressoris ruuning, check M1 and M2.
N.B.: Repeat this test , inverting the manometers : tocalcula-
te the correct Δp consider the average value of the two
readings.
Refrigeration pipeline Pressure drops (Δp bar), at 45_C:
SAt the same geodetic level: Δp ( b a r ) = M 1 --- M 2
SWhen condenser is above the room unit:
Δp (bar) = M1--- M2+geodetic difference (m x 1,1:10,2)
SWhen condenser is below the room unit:
Δp (bar) = M1--- M2---geodetic difference (m x 1,1:10,2)
Fig. h --- Refrigerant line components
76
5432
1
connection
on the Liquid
Receiver
to the
evaporator
1Liquid receiver valve
2Filter dryer inlet Schrader valve
3Filter dryer
4Sight glass
5Solenoid valve
6Thermostatic expansion valve
7Evaporator inlet Schrader valve
8 --- Operation
Unitoperation iscompletely automatic.The below sequence
explainshowtheunitoperates:
SThe air, sucked in by the fan(s), enters the unit.
SThe air is immediately filtered.
SThe TEMPERATURE sensor or HUMITEMP (temperature
+ rel. humidity) sensor (check type installed), verifies the
state of the inlet air, and relays this information to the control
system.
SFiltered new air is injected into the air stream via the
Fresh Air Intake (optional).
SThe treated air passes through the fans, which operate
continuously, and is then dispersed out of the unit.
SUnder unit only: the air passes from the underfloor void
into the room via air distribution outlets.
For ”UNDER” units installed on raised floor: switch
off the machine before removal of the floor panels
within a distance of 850 mm from the machine, to
avoid risks of contact with rotating devices (fans)
moving and with hot heating elements. (see Fig. i).
SThe control system compares the relayed information to
the set point and proportional band values programmed
into its memory: it then commands the air conditioner to
treat the air as follows (see also Control manual):
SCOOLING
Direct expansion mode (DX)
The compressor is started and the cold refrigerant flows
through the evaporator, thus cooling the air passing over
it. For compressor operation see Control manual.
SHEATING
Thiscan takeoneof threeforms:
--- electrical heating (optional): the heating elements
heat the air passing over them. There are 3 heating
steps.
--- hot water heating (optional):ifhotwaterisavailable,
this flows through the hot water coil, thus heating the
air passing over it. The hot water flow is controlled by
a n o n --- o f f ( 3 --- w a y ) v a l v e .
--- hot gas reheat (optional used during dehumidifica-
tion): the hot refrigerant which exits the compressor
flows through the hot gas coil, thus heating the air
passing over it.
S DEHUMIDIFICATION --- optional
DX mode
One of the compressors starts and either the air flow or
the evaporator surface is reduced (depending on the
model), thereby causing dehumidification (refer also to
Control manual).
In freecooling mode: see Control manual.
N.B.: If, during dehumidification, the ambient temperat-
ure drops below a specified level, dehumidification will
be stopped if necessary (see LOW LIMIT intervention in
Control manual).
S HUMIDIFICATION --- optional
The humidifier creates steam, which is distributed into
the air stream via the steam distribution pipe (see also
Enclosure A).
N.B.: Manual control can be performed using the control sys-
tem (see Control manual).
Fig. i --- Floor panels removal on a safety way
850 mm

15 English Liebert HPM --- A/W/F/D/H
9 --- Calibrations & Regulation
(at start---up)
The air conditioner has already been factory---tested and
calibrated, but it is very important to check, at start---up, the
superheating of thermostatic valve (all versions) and the
by---pass hot gas valve (F/D/H/KA/KW).
See Tab. 6 and Tab. 7 (Enclosed B) that show all valves.
SThe air conditioner has already been factory.
SFor calibrations of instruments installed on the external
condensers/Dry coolers refer to the relevant manual.
SFor control system calibrations refer to Control manual
(to prevent erratic operations do not use temperature
and rel. humidity set points/proportional bands which
differ excessively from the Standard Settings).
9.1 -- Setting the thermostatic expansion valve
THIS OPERATION MUST BE PERFORMED BY AN
EXPERI-ENCED REFRIGERATION TECHNICIAN.
The valve has been factory preset and, if necessary, should
be reset as follows:
1) IMPORTANT: Ensure that the instructions in Chap. 4
have been carried out.
2) Allow the compressor to operate for 15 mins.
3) Measure the superheat as follows:
a) Place a contact thermometer on the tube exiting the
evaporator;
b) Connect a manometer (by a tube of max. 30 cm) to
the compressor suction valve.
c) The overheating is the difference between the refri-
gerant saturation temperature corresponding to the
pressure read on the manometer and the real tem-
perature read on the thermometer.
4) The superheat must be 6---7 K; if not, set the expansion
valve as follows:
a) Remove the protective cover;
b) Turn the adjustment screw by 1/4 turn only;
c) Wait 10 minutes.
d) Measure the superheat and repeat the operation if
necessary.
N.B.: If the superheat is too low (compressor cool to the
touch) the screw must be turned in a clockwise direction.
If the superheat is too high (compressor hot to the touch)
the screw must be turned in a counterclockwise direc-
tion.
9.2 -- Adjustment of the hot gas injection valve
as antifreeze mode and partial control of
the capacity (F, D, H and Constant)
THIS OPERATION MUST BE CARRIED OUT BY AN EX-
PERT REFRIGERATION TECHNICIAN.
9.2.1 --- Features
This valve is installed int some special versions (see relevant
refrigeration circuits). It enables a partial control of the evap-
orating pressure, so as to avoid evaporation temperatures
lower than zero degrees centigrade and thus any ice forma-
tion (chilled water side), even with low temperatures of the
return air. It injects hot gas exiting the compressor before the
evaporator through the gas---liquid mixer, so as to keep the
pressure higher than the set value. See the refrigeraton dia-
gram.
9.2.2 --- Adjustment
The min. evaporating pressure is kept by calibrating the
valve as follows.
SDrastically reduce the conditioner air delivery.
SCheck by a precise pressure gauge the evaporating
pressure and the relevant saturation temperature.
SAdjust the valve acting on the adjustment screw, so that
it intervenes when the evaporation temperature has de-
creased to 2° C.
SThen check the correct operation of the thermostatic ex-
pansion valve.
9.3 -- Chilled water valve (F, D and H only)
The 2---way (F) or 3---way (D/H) valve controls the chilled wa-ter
flow and operates as follows (Fig. j):
SWhen the valve is fully open (i.e. max. chilled water flow)
the actuator slot is set to ’1’.
SWhen the valve is closed (i.e. no chilled water flow) the
actuator slot is set to ’0’.
The valve running time is set to the value specified in the
Control Manual.
Note 1: In the unlikely event of control system failure, the
valve can be manually controlled by means of the rotary
knob. It can be used to drive the actuator into any position
between 0 and 1.
Note 2: When actuator stem is completely down, the valve is
open and chilled water coil is supplied.
Fig. j --- Position of the chilled water valve actuator (for 2 or 3---way valve)
0
1
Position indicator on
0=CLOSEDvalve
( 3 --- w a y v a l v e : b y --- p a s s o p e n )
Position indicator on
1=OPENvalve
( 3 --- w a y v a l v e : b y --- p a s s c lo s e d )
0
1